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Optimizing Inventory via Just-in-Time (JIT) Key Management

Problem: Traditional Key-injection Complicates Inventory Management

Semiconductor manufacturers want to be responsive to swings in market demand. But legacy root key creation/storage methods, such as key injection and storage in OTP, require rigid, “early-in-life” personalization. This leads to problems such as complexity, longer lead time, and occasional inventory write-offs.

Drawback of Legacy Methods

Manufacturing

Supply Chain - Problem of Key Management with Key Injection

  • Key management adds complexity and liabilities
  • Key storage mechanisms depend on chip technology process and fabrication plant which adds costs and time to market

Inventory

Effect of key injection on inventory in the supply chain

OEM-specific keys make a rigid inventory build

  • Complex management
  • Potential for inventory write-offs
  • Higher Days Inventory Outstanding (DIO)

Benefits of SRAM PUF Approach

Manufacturing

Supply Chain - Solution with SRAM PUF in Manufacturing

  • No need to handle keys, no supply chain liabilities
  • No additional hardware for secure key storage required

Inventory

Just-In-Time Key Management: SRAM PUF simplifies inventory in the supply chain

  • Common hardware inventory for all OEM customers
  • Secure, even in a non-trustworthy supply chain
  • Precision management of build inventory
  • Lower Days Inventory Outstanding (DIO)

Contract Manufacturer / OEM / In the field

Just-in-time key management: generation of unclonable device-unique keys from the SRAM PUF

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